Ben nodded.
"You're absolutely certain?"
"Of course not," he said. "A number of things might have caused the trouble. This one is a boom-type crane. The mislinks are in the booms, and when it was swinging back from dropping a case inside, it hit something."
"Something? Can this be identified?"
"With a minor interference, we can feel it," said Simpkins. "With a mislink screwdriver, we can feel the interference. If it is hard, we know that someone has—or will drop something in the way."
"And if it is soft, and moves, you can estimate it to be animal," added Ben.
"Can't you probe with a feeler of some sort?"
"We do—and did. There was a body on the ground after the accident."
"No identification possible?"
"None. Probing with a rod in the dark makes identification difficult. We've tried to make some sort of study, such as wearing a magnetic badge with a key-impression on its face—the magnetic to locate and the key to identify, but frankly," and Simpkins frowned deeply, "it's psychologically dangerous. The accident can not be averted. After all, it has happened. And we tried it once, and the man who was hurt—well, knowing he was to be hurt, he went into a mental funk far worse than the accident."